Because he’s the only one with the courage to do what’s right.

Resolved, That Richard B. Cheney, Vice President of the United States, is impeached for high crimes and misdemeanors, and that the following articles of impeachment be exhibited to the United States Senate….

In his conduct while Vice President of the United States, Richard B. Cheney, in violation of his constitutional oath to faithfully execute the office of Vice President of the United States and, to the best of his ability, preserve, protect, and defend the Constitution of the United States, and in violation of his constitutional duty to take care that the laws be faithfully executed, has purposely manipulated the intelligence process to deceive the citizens and Congress of the United States by fabricating a threat of Iraqi weapons of mass destruction to justify the use of the United States Armed Forces against the nation of Iraq in a manner damaging to our national security interests…

Watch him introduce the articles at the link above: to read them, see his website, complete with supporting documents.